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Traffic lights worldwide set to change after Swedish engineer saw red over getting a ticket
Mats Järlström's fight shows you never cross an engineer
By Thomas Claburn in San Francisco 21 Oct 2019

A Swedish engineer's umbrage at a traffic ticket has led to a six-year legal fight and now a global change in the speed with which traffic light signals are timed.

After Mats Järlström lost an initial legal challenge in 2014, a federal judge in January this year ruled Oregon's rules prohibiting people from representing themselves as engineers without a professional license from the state are unconstitutional.

And now Järlström's calculations and advocacy have led the Institute of Transportation Engineers (ITE) to revisit its guidelines [PDF] for the timing of traffic signals. As a result, yellow lights around the globe could burn for longer – ITE is an international advisory group with members in 90 countries.

Järlström discovered a problem with the timing of traffic lights in Beaverton, Oregon, after his wife Laurie received a $260 ticket for a red light violation from an automated traffic light camera in 2013.

Järlström, who studied electrical engineering in Sweden, challenged the ticket, arguing the timing interval for yellow lights fails to account for scenarios like a driver entering an intersection and slowing to make a turn. A slightly longer interval, he argued, would allow drivers making turns on a yellow light to exit intersections before the light turned red. Even a small timing increase would help – the automatically generated ticket in this case was issued 0.12 seconds after the light turned red.

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https://www.theregister.co.uk/2019/10/21/traffic_lights_changed/